Indicating device with two electrically operated signals



May 16,1933. K. F. OPPEGAARD ,909,

INDICATING DEVICE WITH TWO ELECTRICALLY OPERATED SIGNALS Filed NOV. 5,1928 8/ jyd unirao STATES PATENT. OFFICE rnnnnm ofrneaann, or HOVIK NEARosno NORWAY INDICATING DEVICE TWO ELEGTRICALLY OPERATED SIGNALSApplication filed November 5, 1928, Serial No. 317,336, and in GermanyJune 15, 3182 8.

The present invention relates to signalling devices with twoelectrically operated signa s, one of which should always be m functioSignalling devices of this kind are ge'nerally used in connection withcontrolling devices for railway and street trailic,util1zing differentlycoloured light in order to indicate wh'ether'the street or railroad isfree or blocked. v 1

Further, signalling devices of thisliind are utilized in connection withswitch board indicators for'the supervision and control of electricalplants as well as of railway junc tions and the like.

The electric lines *for a device of this kind must be so connected thatone signal is automatically put in operation when the other signal isswitched out and vice versa.

This is obtained in accordance with the present invention in a simplemanner by connecting the electric actuating devices for both signals inseries between the electric current supply lines of the device, andgiving one actuating device a higher electric resistance than the other,whereas the actuating device with the highest electric resistance isprovided with means for being short-circuited in order to be put out ofoperation.

When both actuating devices are connected in series, the one having thelargest electric resistance will be actuated alone, as .it does notpermit the passage of a sufficient amount of current to actuate theother device.

When, however, the said first actuating automatically actuated.

In case the signals consist of lamps with different colours, one choosesaccording to the invention one lamp with high filament resistance, andanother lamp with low filament resistance, in the case of relays, coilsare utilized.

Onxthe drawing a preferred form of the invention is diagraminaticallyillustrated.

Referring to the drawing 1, 2, 3, 4: indi-. cates the sections of asecondary line corresponding to the sections of aprimary line which isnot indicated on the drawing.

The sections 1, 2 an 3, 4 are intercom V nected by means of switches .5,6, 7, which are controlled in any convenient manner by the correspondingswitches of the primary line., The control of the switches 5, 6, 7 maybe purely mechanical ormay be electric or may be carried out in anyother conventional manner well known from switch board indicatbrs. V

- The terminal sections 1, 4 are connected with the positive feed line.The sections 2, 3, thecondition of which is to be indicated by theswitch board indicator are-each connected with a red lamp R and thegreen lamp G which are connected in series between the positive andnegative feed lines.

' One of the lamps, for instance the red lamp, has a low filamentresistance which may be obtalned for instance by utilizing a carbonfilamentfor that lamp, whereas the other lamp, in this case the greenlamp, has a high filament resistance.

In the position indicated on the drawing, the green lamp'will burn andthe red lamp will remain dark'as the green lamp does not let uflicientcurrent through for operating the red lamp.

N If switch 5 is closed, this will however have the effect ofshort-circuiting the green lamp and the red lamp will now receivecurrent directly from the positive line and will be actuated.

In. case the red lamp does not function, no current can pass to thegreen lamp, so that in this case none of the lamps will be actuated.

I claim.

A switch hoard indicator for the. sn per-v vision of a system of lines,electric lanes,

K railway lines, pipe lines and the like and the connecting devicesthereof, means for indicating .on the switch board indicator thecondition of separate sections of the lines,

,7 said means comprising Imirs of erently colored lamps with difierentfilament resistance connected in series, and means controlled by theswitches of the line system represented on the switch hoard indicatorfor slfort-circuiting the lamps having the hi hest filament resistance.

n testimony whereof I have signed my name to this specification.

BL FREDRM OPPEGAAJRD.

